Abstract: In a vehicle exhaust system support structure, an upstream side exhaust pipe connected to an engine is guided to an inlet of a muffler supported on a vehicle body, and a downstream side exhaust pipe coupled to an outlet of the muffler is disposed in the interior of a rear bumper. The upstream side exhaust pipe and the inlet of the muffler are coupled to each other via a flexible tube, thus floatingly supporting the upstream side exhaust pipe in the muffler. The downstream portion of the upstream side exhaust pipe passes through the interior of the flexible tube, and is inserted into the inlet of the muffler.

Abstract: A valve device for a silence opens a bypass passage provided in the silencer to flow exhaust gas through the bypass passage when exhaust gas pressure rises to a certain pressure. The valve device includes a base having a valve opening through which exhaust gas flows, and a plate-like valve for opening and closing the valve opening. The plate-like valve is fixed to the base at its proximal portion, and is bent at both edges thereof in a certain range extending from its distal end toward the proximal portion.

Abstract: In a vehicle exhaust system support structure, an upstream side exhaust pipe connected to an engine is guided to an inlet of a muffler supported on a vehicle body, and a downstream side exhaust pipe coupled to an outlet of the muffler is disposed in the interior of a rear bumper. The upstream side exhaust pipe and the inlet of the muffler are coupled to each other via a flexible tube, thus floatingly supporting the upstream side exhaust pipe in the muffler. The downstream portion of the upstream side exhaust pipe passes through the interior of the flexible tube, and is inserted into the inlet of the muffler.

Abstract: An exhaust manifold 14 extending downwardly is connected to a rear side of a transversely disposed engine E. A primary exhaust pipe portion 16 is connected to the exhaust manifold 14 via a spherical joint 18 provided close to the engine E. Furthermore, a secondary exhaust pipe portion 17 is connected to the primary exhaust pipe portion 16. In the primary exhaust pipe portion 17, a flexible tube 19 is disposed at a position upstream of a support portion to the vehicle body.

Abstract: A valve device for a silence is disclosed. The valve device opens a bypass passage provided in the silencer to flow exhaust gas through the bypass passage when exhaust gas pressure rises to a certain pressure. The valve device includes a base having a valve opening through which exhaust gas flows, and a plate-like valve for opening and closing the valve opening. The plate-like valve is fixed to the base at its proximal portion, and is bent at both edges thereof in a certain range extending from its distal end toward the proximal portion.

Abstract: In manufacturing an exhaust pipe of two-passage construction, a metallic plate having a first end and a second end respectively elongated in a longitudinal direction of the exhaust pipe is prepared. The metallic plate is bent into a substantially S shape in cross section. It has a diametrically extending central partition plate and a substantially semicircular peripheral wall on each lateral side of said partition plate in such a manner that a groove of substantially V shape in cross section having a substantially closed end on a radially inner side and an open end on a radially outer side is formed at each diametrically outer portion of the partition plate. A target is provided so as to elongate along the groove in a manner to extend substantially radially outward from the closed end. A welding arc is generated between the target and a welding gun disposed on a side of the open end such that the substantially closed end and the target are welded together.

Abstract: In manufacturing an exhaust pipe of two-passage construction, a metallic plate having a first end and a second end respectively elongated in a longitudinal direction of the exhaust pipe is prepared. The metallic plate is bent into a substantially S shape in cross section. It has a diametrically extending central partition plate and a substantially semicircular peripheral wall on each lateral side of said partition plate in such a manner that a groove of substantially V shape in cross section having a substantially closed end on a radially inner side and an open end on a radially outer side is formed at each diametrically outer portion of the partition plate. A target is provided so as to elongate along the groove in a manner to extend substantially radially outward from the closed end. A welding arc is generated between the target and a welding gun disposed on a side of the open end such that the substantially closed end and the target are welded together.

Abstract: A cap-like valve body is fitted on an outer circumference of an end portion of a communicating pipe that provides a communication between a plurality of silencing chambers formed in a muffler main body. A compressed coil spring is mounted between a flange of the communicating pipe and a flange of the valve body. Communication holes are formed in a cylindrical portion of the valve body. When the valve body receives the pressure of the exhaust gases at a pressure receiving surface and moves along the axial direction against the biasing force of the spring, the exhaust gases within the communicating pipe flow out of the communication holes to the outside of the valve body.

Abstract: An exhaust manifold 14 extending downwardly is connected to a rear side of a transversely disposed engine E. A primary exhaust pipe portion 16 is connected to the exhaust manifold 14 via a spherical joint 18 provided close to the engine E. Furthermore, a secondary exhaust pipe portion 17 is connected to the primary exhaust pipe portion 16. In the primary exhaust pipe portion 17, a flexible tube 19 is disposed at a position upstream of a support portion to the vehicle body.

Abstract: An exhaust pipe assembly provided with a bellows pipe for connecting an upstream exhaust pipe and a downstream exhaust pipe is disposed so as to form a double pipe construction with a first joint pipe which is connected to the upstream exhaust pipe and a second joint pipe which is connected to the downstream exhaust pipe. A pair of ball receiving portions are disposed on a peripheral surface of the first joint pipe at a distance from each other in a circumferential direction, and a pair of ball receiving portions are disposed on a peripheral surface of the second joint pipe at a distance from each other in a circumferential direction. The ball receiving portions are disposed at an angular phase difference with each other in the circumferential direction.

Abstract: A connecting structure for exhaust pipes wherein a first connecting flange is connected to peripheries of downstream-end portions of a plurality of upstream exhaust pipes, a second connecting flange is connected to peripheries of upstream-end portions of a plurality of downstream exhaust pipes, and a plurality of spherical joints is provided between the two connecting flanges. Additionally, each of the spherical joints includes an annular seal unit adapted to be held in place between the fist and second connecting flanges, a spherical bearing surface formed on one of the connecting flanges, and a flat bearing surface on the other one of the connecting flanges. Each annular seal unit including a spherical portion on one side, and a flat portion on an opposite side. The spherical bearing surfaces on the one connecting flange are in slidable spherical contact with respective spherical portions formed on the annular seal units.

Abstract: An exhaust pipe layout structure for vehicles comprises a first exhaust pipe extending from an exhaust manifold coupled to a rear side of a cylinder head of an engine toward the rear of a vehicle body, a second exhaust pipe and a catalyzer which are connected to each other with two flexible joints. A first inclined portion inclines toward the rear in a downward direction and a second inclined portion inclines toward the rear in an upward direction are provided in front of and behind a lowest point of the first and second exhaust pipes, respectively, and a drive shaft for a front wheel and a steering gear box for the front wheels are disposed in front of and behind the first inclined portion, respectively.

Abstract: In a vehicle exhaust system, downstream end portions of front and rear exhaust pipes Ef, Er which respectively connect to front and rear cylinder banks are arranged side by side with each other in the same direction so as to be connected to a common collecting exhaust pipe 22, so that exhaust gases flowing through the front and rear exhaust pipes Ef, Er are allowed to flow into the common collecting exhaust pipe 22 in the same direction. Mating faces 15f, 20f are respectively formed on the end portions of the front and rear exhaust pipes Ef, Er which are located closer to the collecting portion, and the mating faces 15f, 20f are confronted from each other. The mating faces are inclined relative to a plane (P-P) passing through centers Ca, Cb of the front and rear exhaust pipes Ef, Er.

Abstract: An exhaust pipe assembly of two-passage and double-pipe construction has an inner pipe; a partition plate meeting the inner pipe at both diametrical meeting ends thereof so as to be elongated in a longitudinal direction of the inner pipe. Two passages divided across a diameter of said inner pipe are thus formed. The assembly also has an outer pipe which covers the inner pipe with a thermally insulating space around a periphery of the inner pipe. The outer pipe has on one longitudinal end thereof a connecting portion for connection with a mating member. One end of the inner pipe is fixedly connected to the outer pipe with a clearance between the periphery of the inner pipe near each of the meeting ends and an inner circumference of the outer pipe.

Abstract: In manufacturing an exhaust pipe of two-passage construction, a metallic plate having a first end and a second end respectively elongated in a longitudinal direction of the exhaust pipe is prepared. The metallic plate is bent into a substantially S shape in cross section. It has a diametrically extending central partition plate and a substantially semicircular peripheral wall on each lateral side of said partition plate in such a manner that a groove of substantially V shape in cross section having a substantially closed end on a radially inner side and an open end on a radially outer side is formed at each diametrically outer portion of the partition plate. A target is provided so as to elongate along the groove in a manner to extend substantially radially outward from the closed end. A welding arc is generated between the target and a welding gun disposed on a side of the open end such that the substantially closed end and the target are welded together.

Abstract: In a vehicle exhaust system, downstream end portions of front and rear exhaust pipes Ef, Er which respectively connect to front and rear cylinder banks are arranged side by side with each other in the same direction so as to be connected to a common collecting exhaust pipe 22, so that exhaust gases flowing through the front and rear exhaust pipes Ef, Er are allowed to flow into the common collecting exhaust pipe 22 in the same direction. Mating faces 15f, 20f are respectively formed on the end portions of the front and rear exhaust pipes Ef, Er which are located closer to the collecting portion, and the mating faces 15f, 20f are confronted from each other. The mating faces are inclined relative to a plane (P-P) passing through centers Ca, Cb of the front and rear exhaust pipes Ef, Er.

Abstract: A cap-like valve body 37 is fitted on an outer circumference of an end portion of a communicating pipe 35 that provides a communication between a plurality of silencing chambers formed in a muffler main-body. A compressed coil spring 39 is mounted between a flange 35b of the communicating pipe 35 and a flange 37d of the valve body 37. Communication holes 38 are formed in a cylindrical portion 37a of the valve body 37. When the valve body 37 receives the pressure of the exhaust gases at a pressure receiving surface 37b and moves along the axial direction against the biasing force of the spring 39, the exhaust gases within the communicating pipe 35 flow out of the communication holes 38 to the outside of the valve body 37.

Abstract: An exhaust pipe assembly provided with a bellows pipe for connecting an upstream exhaust pipe and a downstream exhaust pipe is disposed so as to form a double pipe construction with a first joint pipe which is connected to the upstream exhaust pipe and a second joint pipe which is connected to the downstream exhaust pipe. A pair of ball receiving portions are disposed on a peripheral surface of the first joint pipe at a distance from each other in a circumferential direction, and a pair of ball receiving portions are disposed on a peripheral surface of the second joint pipe at a distance from each other in a circumferential direction. The ball receiving portions are disposed at an angular phase difference with each other in the circumferential direction.

Abstract: To a housing having a valve opening which serves as a bypass passage for exhaust gases, there is fixed one end portion of a plate valve which is capable of elastic deformation by deflection. The housing is provided with an enclosing wall which projects in a direction of opening of the plate valve in a manner to enclose the plate valve. A valve opening is formed by an inner peripheral space of the enclosing wall. When the exhaust gas pressure exceeds a predetermined pressure, the plate valve is deformed to a position beyond the open end of the enclosing wall, whereby the valve opening is opened to passage. A plate spring to contact the plate valve is provided. With an increase in the amount of deflection in the opening direction, the position of contact of the plate spring deviates toward a fixing end of the plate valve. The bending moment to be applied to the plate valve in a closing direction decreases.

Abstract: In an automobile, a silencer connected to an exhaust pipe includes a casing made of thermally resistant synthetic resin and provided at an inner surface with a thermally insulating material. The silencer is disposed between a side frame and a side body and covered with an undercover from below the silencer and is disposed between a side frame and a side body of an automatic vehicle in a space behind a rear wheel.